Has an International Rugby game ever ended 43-35?
Exactly once. On March 17, 2001, Wales beat France 43-35, and no International Rugby game before or since has ended that way. When it happened it was a scorigami, the first 43-35 in league history.
That makes 43-35 the 510th most common final score out of 844 that have ever occurred in International Rugby. One point away, 44-35 has happened never and 43-36 has happened never.